I suggest you ...

Sort the list by the actual book value in "Most Valuable" report

Currently this report appears to list the books you have in Descending Order by the highest Profit amount, not the highest Book Value. The title of the report suggests it should list by the value of the book you have, not the profit.

How about make all lists in the "Most Valuable" report sortable? i.e. ascending/descending icons next to each Value, Paid, and Profit tab so they sort when clicked. I think it would also be interesting to see how much you paid the most for your books.